Facebook has introduced two updates to page insights with the aim of giving page administrators a clearer picture of past & present.
Earlier, only the data of two to three days prior to the current date was available on Facebook. All the metrics displayed in tabs for overview, likes, reach, and posts will now have real-time data. This will however not include "where your page likes came from".
Page Administrators will be able to see the data back to July 19, 2011, the day when page insights was launched. Earlier, only 89 days' worth of data was available.
Both the updates are available to page owners globally.Facebook Page Insights Now Features with Real-Time Data!,